Step stool



FIG. 1 is a right side elevational view of a step stool in an open position showing our new design;

FIG. 2 is a left side elevational view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is a front perspective view thereof. 

We claim the ornamental design for a step stool, as shown and described. 